Fix problems related to Chrome 22 update

In the morning of 27 Sep, with the new Chrome 22 update, a bunch of problems appeared:

• div#main was appearing above anything else on that page
• Michael fixed the div#main issue, but then another problem appeared:
  top-right viewers call-out (e.g. LSC, EEG, Timeseries...) is not longer visible, although we checked and the HTML is still included in the page
• User pages have now the messageDiv above the action toolbar on the right.